ERROR: Could not find a version that satisfies the requirement pkg_resources==0.0.0 (from versions: none)

这个错误是由于找不到满足要求的pkg_resources版本引起的。解决这个问题的方法有几种。一种方法是删除requirements.txt文件中对应的内容。另一种方法是使用镜像源来解决问题。你可以将下载指令更改为以下形式：pip install 包名 -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com。这样就可以使用豆瓣镜像源来下载包。另外，你也可以选择其他的镜像源，如清华源、阿里源等。只需要将pip源更改为相应的镜像源即可。\[1\]\[2\]\[3\]
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